shinra_lackey

X or X/1999 is a series produced by the manga group CLAMP that incorporates characters from Tokyo Babylon and Clamp Campus Detectives. The main character, Kamui, is charged with deciding the fate of the world by becoming a Dragon of Earth and destroying the kekkai that hold the world together or a Dragon of Heaven and protecting them. Whichever side he chooses, his opposing star will join the opposite side for a final showdown on the fated day in 1999.

The gay, you ask? This is CLAMP people, their ambiguous male parings are practically cannon and have almost as much, if not more in some cases, clout as the straight pairings floating around. The recommendations here will focus mostly on Seishirou/Subaru as they are my hardcore OTP in the fandom with the occasional Fuuma/Kamui, Nokoru/Suoh, or Arashi/Sorata thrown in the mix in the future.
( A little more info, definite spoilers under here )

Two Minute Tokyo Babylon by rayemars (TB, oneshot, crack)
Once Upon a Time in Tokyo... by pengiesama (TB, oneshot, humor)
YET MORE HOW TO SURVIVE A SCARY MOVIE VS. HOW TO SURVIVE A CLAMP MANGA by pengiesama (CLAMP, oneshot, crack)
Russian Roulette by insaneidiot (X, oneshot, crackish) author recced by tomomichi
The Stalker You Know by insaneidiot (X, oneshot, humor)
Sorata's Big Gay Adventure by insaneidiot (X, oneshot, crack)
Happy Families by insaneidiot (X, oneshot, crack)
Whoops by Rackham Rose (X, oneshot)